Mattress element



FIG. 1 is a front end view of a first embodiment of a mattress element showing my new design;

FIG. 2 is a front, top perspective view thereof;

FIG. 3 is a front, bottom perspective view thereof;

FIG. 4 is a front end view of a second embodiment of a mattress element showing my new design;

FIG. 5 is a front, top perspective view thereof; and,

FIG. 6 is a front, bottom perspective view thereof. 

The ornamental design for a mattress element, as shown and described. 